Median Age in Jefferson County, IL
ACS 2024 5-Year Estimates
How Jefferson County Compares
National Distribution
Where Jefferson County falls among all 3,222 U.S. counties for median age.
■ Jefferson County: 41.2 years
Ranking Context
| Rank | County | Value |
|---|---|---|
| #1,733 | Pike County, AR | 41.2 years |
| #1,734 | Hamilton County, FL | 41.2 years |
| #1,735 | Nez Perce County, ID | 41.2 years |
| #1,736 | Jefferson County, IL | 41.2 years |
| #1,737 | Jasper County, IN | 41.2 years |
| #1,738 | Ripley County, IN | 41.2 years |
| #1,739 | Allen County, KS | 41.2 years |
Median Age in Jefferson County, Illinois
Jefferson County, Illinois has a median age of 41.2 years, which ranks #1,736 of 3,222 out of 3,222 counties nationwide. This is 5.9% above the national value of 38.9 years.
Within Illinois, Jefferson County ranks #67 of 102 out of 102 counties. This places it in the 46th percentile nationally.
The median age of the total population. All data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates for 2024.
About this data
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2024). All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.